Column cap for concrete buildings



July 17, 1923. 1,461,892 I F. H. CONE-Y COLUMN *CAP FOR CONCRETEBUILDINGS Fil ed Dec. 18, 1922 and useful Improvement To all whom it mayconcern:

.larly columns with the floors and reinforcing the .fectiveness for theintended work,

Patented July 1?, 192i":u

FRANKLIN H. CONEY. or CHIQAGOQILLINOIS,

contra/Ln C/AI'I non CONCRETE BUILDINGS.

Application filed December 18, 1922. Serial No..607,594', I

Be it known that l, FRANKLIN loner,- a citizen of the United Statesof'America,

and a resident of Chicago,-county of Cook,

and State of Illinois, have invented a new in Column Caps for ConcreteBuildings, of. which the following is a specification. 1 a. i

This invention relates to buildings having reinforced concrete floors,and particuto column caps for connecting the structure at such point.

The object of the invention is to a column cap of extreme simplicity andprovide whose vertical dimensions are such that it may be containedbetween the upper and lower surfaces of the floor slab and be a part ofsame.

7 The object of the invention is accomplished by the device shown in theaccompanying drawing, wherein:

Figure 1 is a bottom plan view of a column cap constructed according tothis invention and showing in section a steel column incased inconcrete.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1, andincludes a showing of the relation between the steel and concrete partsof the structure.

It is well known that the maximum stresses in a reinforced concretefloor and the most-difficult to counteract, are those occurring in thefloor adjacent tothe columns. A number of plans have been proposed forproperly reinforcing concrete structures at the points of connection ofthe columns and the floors. Some of the proposed arrange ments involveunsightly enlargements of the columns near the floor or requireexpensive and complicated forms, and others are more or less complicatedin design, or unsatisfactory in not being of the required strength orinterfering with the pouring of the cement.

The construction shown in the drawings, so far as is known, overcomesall objections to prior column caps, is of ample strength, is simple indesign and inexpensive. This column cap or reinforcement is in the formof a frustum of a cone or a pyramid, or other dished arrangement havingringshaped reinforcements at its outer and inner rims. The webconnecting the inner and outer reinforced rings, is a laminated andplate having greaterstrength and thicknessnear the nner-ring andtapering in'thickneSS, to the outer r ng. The stresses produced in thecap due to the weight of the floorlan'd ltSlOLd, results in theouterring normally being under tension, and inner ring being.

undercompression and the shear being re sisted by the web between therings.

As shown inthe drawing, the column cap conslsts of an innercollar-shaped compres sion member 1, the horizontal flange 2, of

which, is riveted to the annularweb member 3, built up froma pluralityof ring-shaped plates 5, 6 and 7 The web member is of dishform, i.e.,inclined upwardly and outwardly from the compression ring 1 to theperipheral reinforcing tension rings 8 and.

9. Rings 8 and 9 are riveted to the part 7 of theiweb member by therivets 10, and the parts 5, 6 and? of the web member are securedtogether b the rivetsll; and 12. The column cap t rough the compressionmember 1 rests upon the flanges 13 riveted to the steel part 14 of thecolumn 15. The floor rod reinforcements are indicated by the numeral 16,and these rod reinforcements may be arranged in any of the approvedmanners, such as according to the two or four-way systems.

Stirrups 17 at assist in resisting shear in the concrete, and alsostirrups 18 depending from the cap inside of its periphery insure goodadhesion of the concrete to the cap.

From the foregoing it may be seen that the column cap tapers inthickness from the inner compression part 1 thereof, outwardly to theamply strengthened tension periphcry of the cap, thus affording areliable and simple structure, not in any way requiring expensive formsfor the concrete or interfering with the pouring of the concrete.

The specific design of the construction herein shown and described, maybe varied to suit different requirements as to strength and cost, theidea of the invention being mainly to provide a hollow metallic columncap conforming to the surface of an inverted frustum of a cone. The capmay be a single piece of metal of substantially uniform thickness, inwhich case, the metal near the outer edge, due to the greatercircumference being in excess of that near the inner edge, will properlyact inrtension for circuinthe periphery of the cap ferential stresses,as well as in compression 1 l for radial stresses. The metal near theinner edge will takejboth radial andcircumfer-V ential stresses. 'Likewise, the cap may also be made with inner and outer rings in differentplanes, as shown in the drawing, with the design of the connectingdvebvaried to LA-column cap comprising inner andv outer reinforcing ringslocated in different parallel planes, and an annular Web memberconnecting said rings;

.2: A column cap" comprising inner and outer, reinforcing rings locatedin different parallel'planes, and an annular Web member connecting saidrings, said Web tapering in thickness from the inner ring toward theouter'ring. I i

arr-column cap comprising inner'and outer reinforcing rings located indifferent parallelplanes, and anannular'web member connecting saidrings, said web tapering in "thickness from the in'ner' ring toward theouter ring' and" comprising a plurality of plates'secured together; Y Y

4:. A concrete structure-comprising a columnon which is supported at thelocation of a floor, a floor reinforcement surrounding the, column, saidfloor reinforcement comprising an outer tension ring and an innercompression ring, theinner compression ring being in a lower plane thanthe outer tension ring; and a Web member inclined upwardly from theinner. ring to the outer ring.

5. A concretestructure-comprisinga: column on which is supported'at thelocation of a floor, a-floor'reinforceinent resting onsaid flange andsurrounding the column, said floor reinforcement comprising an outertension ring and an inner compression ring, the inner compression ringbeing in a lower plane than the outer tension ring; and a Web mem berinclined upwardly from the inner ring to the outer ring, said Web membertapering in outer ring.

on columnsand a hollow metallic column-cap connecting a column With thefloor; conforming to the surface of an frustum ofayoone.

Signed at 136131922.

inverted FRANKLIN me thickness from the inner ring toward the said cap,

outage this17tl1 da ofNoVem-

